Is this one oral thrush or milk residue? picture attached

A. Idhu, seeming more like that there is much too much of milk accumulated on the tongue of your child. Seems like you have never clean data of the child. When you giving a bath to the child artist buy this is Just milk which has accumulated and that is why it is looking like this, you have to clean the tongue properly whenever you giving a bath to the child with a oral tongue cleaner